第一个原则是研究小波拉龙和Li扩散在分层LiCoO中的研究.
Seryung Ahn1, Jiyeon Kim2,3, Bongjae Kim1,4
1Department of Physics, Kyungpook National University, Daegu 41566, South Korea.
Physical chemistry chemical physics : PCCP
|October 10, 2023
概括
氧化中的局部磁力稳定了极子,阻碍了离子扩散. 然而,磁性排序在能量方面是有利的,这表明电池中离子运输的极子迁移机制.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 计算材料科学科学 计算材料科学
背景情况:
- 离子 (Li-ion) 导电性对于离子电池中的正极材料性能至关重要.
- 了解离子扩散机制对于设计高性能电池至关重要.
研究的目的:
- 研究磁性排序对极子稳定性和离子扩散在分层LiCoO2中的作用.
- 阐明离子扩散的机制,特别是极子的贡献.
主要方法:
- 使用密度函数理论 (DFT) 的计算.
- 在各种磁性配置下对极子稳定性和离子扩散屏障的分析.
主要成果:
- 在LiCoO2的局部磁力促进局部化的Co4+极子,增加离子扩散屏障到~0.34 eV.
- 极子迁移发生在与离子运动相反的方向.
- 非磁性结构具有较低的离子扩散屏障 (~0.21 eV),但在能量方面不太稳定.
结论:
- 该研究主张在离子扩散中采用一个洞极子迁移场景.
- 在 (Co) 离子中强大的电子相关性对于稳定Co4+极子至关重要.
- 尽管扩散障碍增加了,但磁性有序结构受到青,突出了磁性和离子传输之间的复杂相互作用.
更多相关视频
相关概念视频
Trends in Lattice Energy: Ion Size and Charge
23.9K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.9K
Coulomb's Law and The Principle of Superposition
9.0K
Coulomb's Law describes the force experienced by two point charges under each other's presence. But what if there are more than two charges? For example, if there is a third charge, does it experience a force that is a simple combination of the individual forces due to the first two charges? Can it be described mathematically?
The Principle of Superposition answers the question. Yes, Coulomb's Law applies to each pair of charges, and the net force on each charge is the vector sum of...
The Principle of Superposition answers the question. Yes, Coulomb's Law applies to each pair of charges, and the net force on each charge is the vector sum of...
9.0K
Metallic Solids
18.4K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.4K


